tftpboot/scripts/download_debian.sh

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#!/bin/bash
# Purpose {{{
# This script will download Debian netboot installer for both AMD64 and i368
# 1. Debian Stable (Bullseye)
# 2. Debian oldStable (Buster)
# 3. Debian oldoldStable (Stretch)
# 4. Debian Unstable (Sid)
# and make a sample menu.cfg config file.
# }}}
# Vars {{{
readonly PROGNAME=$(basename "${0}")
readonly NBARGS="${#}"
[ -z "${DEBUG}" ] && DEBUG=1
## Export DEBUG for sub-script
export DEBUG
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# Default value for TFTP's directory
if command -v in.tftpd > /dev/null; then
source /etc/default/tftpd-hpa
else
TFTP_DIRECTORY="/srv/tftp"
fi
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# Where to store Debian's installers
DEBIAN_INSTALLER_DIR="${TFTP_DIRECTORY}/installer/debian"
# tftp sample config file
DEBIAN_CONFIG_PXE="${DEBIAN_INSTALLER_DIR}/menu.cfg.example"
## Colors
readonly PURPLE='\033[1;35m'
readonly RED='\033[0;31m'
readonly RESET='\033[0m'
readonly COLOR_DEBUG="${PURPLE}"
# }}}
usage() { # {{{
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cat <<- EOF
usage: $PROGNAME [-d|-h]
This script will download "all" Debian's netboot installer for
tftp server for both AMD64 and i368 architectures.
EXAMPLES:
- Download Debian's installers to default place (${TFTP_DIRECTORY})
${PROGNAME}
OPTIONS:
-d,--debug
Enable debug messages.
-h,--help
Print this help message.
EOF
}
# }}}
debug_message() { # {{{
local_message="${1}"
## Print message if DEBUG is enable (=0)
[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG ${PROGNAME}: ${local_message}"
return 0
}
# }}}
error_message() { # {{{
local_error_message="${1}"
local_error_code="${2}"
## Print message
printf '%b\n' "ERROR ${PROGNAME}: ${RED}${local_error_message}${RESET}"
exit "${local_error_code:=66}"
}
# }}}
download_file() { # {{{
local_url="${1}"
local_dest_file="${2}"
debug_message "download_file \
Download ${local_url} to ${RED}${local_dest_file}${COLOR_DEBUG} ."
wget --quiet "${local_url}" --output-document="${local_dest_file}"
## Unset variables
unset local_url
unset local_dest_file
}
# }}}
is_file_empty() { # {{{
local_file="${1}"
## File is empty by default
return_is_file_empty="0"
### Check if the file is empty
if [ ! -s "${local_file}" ]; then
return_is_file_empty="0"
debug_message "is_file_empty \
The file ${RED}${local_file}${COLOR_DEBUG} is empty or doesn't exists."
else
return_is_file_empty="1"
debug_message "is_file_empty \
The file ${RED}${local_file}${COLOR_DEBUG} exists and has a size greater than zero."
fi
## Unset variables
unset local_file
return "${return_is_file_empty}"
}
# }}}
main() { # {{{
# Create directories and config file
debug_message "Main \
Create ${DEBIAN_INSTALLER_DIR} tree."
mkdir --parents -- "${DEBIAN_INSTALLER_DIR}" \
|| error_message "Can't create ${DEBIAN_INSTALLER_DIR} directory." "1"
debug_message "Main \
(re)Create ${DEBIAN_CONFIG_PXE} sample config file."
true > "${DEBIAN_CONFIG_PXE}"
# Parse all Debian's distribution
for DISTRO in bullseye buster stretch sid; do # For "all" Debian's version
## Then parse architecture
for ARCH in amd64 i386; do # For all classic architecture
debug_message "Main FOR loop \
Manage ${RED}${DISTRO}${COLOR_DEBUG} release with ${RED}${ARCH}${COLOR_DEBUG} architecture."
### Create destination directory
mkdir --parents -- ${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH} \
|| error_message "Can't create ${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH} tree." "1"
### Download linux file
download_file "http://deb.debian.org/debian/dists/${DISTRO}/main/installer-${ARCH}/current/images/netboot/debian-installer/${ARCH}/linux" \
"${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/linux"
is_file_empty "${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/linux" \
&& error_message "${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/linux is empty !" "2"
### Download initrd.gz
download_file "http://deb.debian.org/debian/dists/${DISTRO}/main/installer-${ARCH}/current/images/netboot/debian-installer/${ARCH}/initrd.gz" \
"${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/initrd.gz"
is_file_empty "${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/initrd.gz" \
&& error_message "${DEBIAN_INSTALLER_DIR}/${DISTRO}/${ARCH}/initrd.gz is empty !" "2"
### Config file
debug_message "Main FOR loop \
Add tftp config sample."
/bin/cat >> "${DEBIAN_CONFIG_PXE}" << EOF
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label ${DISTRO}${ARCH}
menu label Debian GNU/Linux ${DISTRO} ^${ARCH} bits
kernel installer/debian/${DISTRO}/${ARCH}/linux
append vga=normal initrd=installer/debian/${DISTRO}/${ARCH}/initrd.gz -- quiet
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EOF
done
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# Config file
/bin/cat >> "${DEBIAN_CONFIG_PXE}" << EOF
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label separator
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menu label ---
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EOF
done
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# Config file
/bin/cat >> "${DEBIAN_CONFIG_PXE}" << EOF
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label mainmenu
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menu label ^Back...
menu exit
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EOF
}
# }}}
# Manage arguments # {{{
# This code can't be in a function due to argument management
if [ ! "${NBARGS}" -eq "0" ]; then
manage_arg="0"
## If the first argument is not an option
if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
then
## Print help message and exit
printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
printf '%b\n' "---"
usage
exit 1
fi
# Parse all options (start with a "-") one by one
while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
case "${1}" in
-d|--debug ) ## debug
DEBUG=0
;;
-h|--help ) ## help
usage
## Exit after help informations
exit 0
;;
* ) ## unknow option
printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
printf '%b\n' "---"
usage
exit 1
;;
esac
debug_message "Arguments management \
${RED}${1}${COLOR_DEBUG} option managed."
## Move to the next argument
shift
manage_arg=$((manage_arg+1))
done
debug_message "Arguments management \
${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
else
debug_message "Arguments management \
No arguments/options to manage."
fi
# }}}
main
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exit 0